The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A107364 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A107364

Numbers of the form (3^i)*(13^j).
(history; published version)

#30 by Charles R Greathouse IV at Thu Sep 08 08:45:18 EDT 2022

PROG

(MAGMAMagma) [n: n in [1..10^7] | PrimeDivisors(n) subset [3, 13]]; // Vincenzo Librandi, Jun 27 2016

Discussion

Thu Sep 08

08:45

OEIS Server: https://oeis.org/edit/global/2944

#29 by Vaclav Kotesovec at Wed Sep 23 03:35:29 EDT 2020

STATUS

editing

approved

#28 by Vaclav Kotesovec at Wed Sep 23 03:35:21 EDT 2020

FORMULA

a(n) ~ exp(sqrt(2*log(3)*log(13)*n)) / sqrt(39). - Vaclav Kotesovec, Sep 23 2020

STATUS

approved

editing

#27 by Joerg Arndt at Wed Sep 23 02:42:11 EDT 2020

STATUS

reviewed

approved

#26 by Vaclav Kotesovec at Wed Sep 23 02:39:36 EDT 2020

STATUS

proposed

reviewed

#25 by Amiram Eldar at Wed Sep 23 02:09:38 EDT 2020

STATUS

editing

proposed

#24 by Amiram Eldar at Wed Sep 23 01:52:42 EDT 2020

KEYWORD

nonn,easy,changed

#23 by Amiram Eldar at Wed Sep 23 01:52:20 EDT 2020

LINKS

Amiram Eldar, <a href="/A107364/b107364.txt">Table of n, a(n) for n = 1..10000</a>

FORMULA

Sum_{n>=1} 1/a(n) = (3*13)/((3-1)*(13-1)) = 13/8. - Amiram Eldar, Sep 23 2020

STATUS

approved

editing

#22 by Alois P. Heinz at Wed Sep 02 19:46:34 EDT 2020

KEYWORD

nonn,changed

nonn

STATUS

proposed

approved

#21 by Richard Peterson at Wed Sep 02 19:38:51 EDT 2020

STATUS

editing

proposed